they want tougher gun laws, but the second amendment makes that a tricky proposition. i spoke with cnn legal contributor paul cowan for his take on how the supreme court interprets the right to bear arms. >> the supreme court has held that the second amendment permits people to keep weapons in their house for self-protection, but it doesn't say anything about high-capacity magazines and it doesn't say anything about what kind of guns we're allowed to keep. certainly well reasoned reinstructions are okay under the second amendment. >> outlaw the assault rifles and the large ammunition clips that we had to talk so much about. what will that mean for the gun owners that currently have them? >> this is a good question. when we talk about gun control, it is a political question. there are 450 million firearms in america at this moment. there is a huge amount of weaponry out there. some of those are these, what we call assault weapons, gun enthusiasts say they're just sort of rifles that you can, you can change the configuration of and you only have to pull the trigger once